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-rw-r--r--libavfilter/af_aformat.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/libavfilter/af_aformat.c b/libavfilter/af_aformat.c
index f4ea0dd887..59a2d5aa09 100644
--- a/libavfilter/af_aformat.c
+++ b/libavfilter/af_aformat.c
@@ -23,6 +23,7 @@
* format audio filter
*/
+#define _BSD_SOURCE
#include "libavutil/audioconvert.h"
#include "avfilter.h"
#include "internal.h"